package com.example.config;


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 *  解决前后端跨域问题的配置类
 */

@Configuration
public class CorsConfig implements WebMvcConfigurer {

    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();   //跨域的配置
        corsConfiguration.addAllowedOrigin("*");                        //允许所有的来源
        corsConfiguration.addAllowedHeader("*");                        //所有的请求头
        corsConfiguration.addAllowedMethod("*");                        //所有的方法都允许访问
        corsConfiguration.addExposedHeader("Authorization");
        return corsConfiguration;
    }

    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")             //所有的请求
                .allowedOrigins("*")                        //所有的来源
//              .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT")    //所有的请求形式都可以访问
                .maxAge(3600);
    }

}
